Swift how to deselect Collection Cell - swift

Question

TenViewController code :
class TenViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
var selectedCell: UICollectionViewCell!
var arrayLocation = ["aaa", "bbb", "ccc", "ddd", "eee"]
var myCollectionView: UICollectionView!
func numberOfSections(in collectionView: UICollectionView) -> Int
{
return 1
}
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int
{
return arrayLocation.count
}
collection delegate
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MyCollectionViewCell
cell.backgroundColor = UIColor.white
cell.titleLabel?.text = arrayLocation[indexPath.row]
cell.titleLabel.font = UIFont.systemFont(ofSize: 24)
return cell
}
// check cell and do somthing
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath)
{ selectedCell = myCollectionView.cellForItem(at: indexPath)! selectedCell.contentView.backgroundColor = UIColor.red
collectionView.allowsSelection = true
collectionView.allowsMultipleSelection = true
}
I trying to use this func but it doesn't work
func collectionView(_ collectionView: UICollectionView,didDeselectItemAt indexPath: IndexPath) {
myCollectionView.deselectItem(at: indexPath, animated: false) }
override func viewDidLoad() {
//get view size
let fullsize = UIScreen.main.bounds.size
//get collectionViewCell layout
let layout = UICollectionViewFlowLayout()
//cell size
layout.itemSize = CGSize(width: 120, height: 30)
//mycollectionView size
myCollectionView = UICollectionView(frame: CGRect(x: 108, y: 70, width: fullsize.width - 70, height: fullsize.height - 180), collectionViewLayout: layout)
myCollectionView.delegate = self
myCollectionView.dataSource = self
myCollectionView.backgroundColor = UIColor.white
myCollectionView.register(MyCollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
layout.sectionInset = UIEdgeInsetsMake(0, 5, 0, 50);
layout.minimumLineSpacing = 10
layout.minimumInteritemSpacing = 0.5
myCollectionView.backgroundColor = UIColor(patternImage: myPag)
self.view.addSubview(myCollectionView)
}
}
MyCollectionViewCell code
class MyCollectionViewCell: UICollectionViewCell {
var titleLabel:UILabel!
override init(frame: CGRect) {
super.init(frame: frame)
// create UILabel
let w = Double(UIScreen.main.bounds.size.width)
titleLabel = UILabel(frame:CGRect(x: 0, y: 0, width: w/3 - 10.0, height: 30))
titleLabel.textAlignment = .center
titleLabel.textColor = UIColor.black
self.addSubview(titleLabel)
}
required init?(coder aDecoder: NSCoder)
{
fatalError("init(coder:) has not been implemented")
}
}
I would like to get cell deselect and what should I do?
Does anyone can help me plz thanks mate!!
how to make a button can chose all of cell?

Answer 1

You need to set property allowsSelection and allowsMultipleSelection also in viewDidLoad instead of didSelectItemAt indexPath, Also you reusing the cell so your selection of cell is change when you scroll the CollectionView for preventing this issue create one instance of type [IndexPath] and access it in your collectionView's method like this.
var selectedCell = [IndexPath]()
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MyCollectionViewCell
cell.titleLabel?.text = arrayLocation[indexPath.row]
cell.titleLabel.font = UIFont.systemFont(ofSize: 24)
if selectedCell.contains(indexPath) {
cell.contentView.backgroundColor = .red
}
else {
cell.contentView.backgroundColor = .white
}
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)!
selectedCell.append(indexPath)
cell.contentView.backgroundColor = .red
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)!
if selectedCell.contains(indexPath) {
selectedCell.remove(at: selectedCell.index(of: indexPath)!)
cell.contentView.backgroundColor = .white
}
}

Answer 2

Swift 3.0 Solution
extension UICollectionView {
func deselectAllItems(animated: Bool = false) {
for indexPath in self.indexPathsForSelectedItems ?? [] {
self.deselectItem(at: indexPath, animated: animated)
}
}
}
How to use?
myCollectionView.deselectAllItems(false)